0 happening, published etc once every three months -- trimestrale
a quarterly journal
quarterly payments.
1 once every three months -- trimestralmente
We pay our electricity bill quarterly.
2 a magazine etc which is published once every three months. -- pubblicazione trimestrale
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Possiamo completarlo passo dopo passo, indipendentemente dalla lunghezza della strada, e non può essere completato, per quanto breve sia la strada, se non segni nemmeno la tua impronta.